When you cut a WAV or FLAC file, the cutter can simply copy the relevant PCM samples — no encoding or decoding required. The output is bit-perfect. For lossy formats like MP3 or AAC, true "lossless cutting" is complicated by the fact that audio is stored in compressed frames. A cut in the middle of a frame requires either decoding and re-encoding (introducing quality loss) or accepting a slight imprecision at the cut boundary. FFmpeg's stream copy mode cuts at the nearest frame boundary, which typically means a difference of a few milliseconds — imperceptible in practice for most content.
Free Online Audio Cutter
Trim & Cut Audio Files Precisely
Cut any audio file to the exact clip you need by setting a start time and duration. Perfect for creating ringtones, trimming intros, extracting song sections, or editing podcast segments — all online.
Set exact start time & duration
No quality loss during cutting
Supports MP3, WAV, FLAC, AAC & more
Drop your audio file here
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MP3, WAV, FLAC, AAC, OGG, M4A • Up to 100 MB free
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Files deleted in 2h
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Simple & Fast
How to Use Audio Cutter
Convert your files in three simple steps — no software, no signup.
01
Upload Your Audio File
Upload any audio file in MP3, WAV, FLAC, AAC, OGG, M4A, or other supported format. Maximum file size is 500 MB.
02
Set Start Time & Duration
Enter the start timestamp (e.g. 0:30 for 30 seconds in) and the duration of the clip you want to extract (e.g. 0:45 for a 45-second clip).
03
Download Your Clip
The cut audio is processed server-side and downloaded in the same format as the original, preserving the original codec and quality.
Features
Why Use Audio Cutter?
Frame-Accurate Cutting
Specify your trim points down to the millisecond using HH:MM:SS.mmm format for surgical precision on any audio file.
Ringtone Creator
Cut the best 30 seconds of any song to create a custom ringtone for iPhone or Android — no desktop software required.
Podcast Editing
Remove unwanted intros, outros, or silence from podcast episodes quickly. Extract specific interview segments without re-encoding.
Extract from Video
Upload a video file to extract and trim a specific audio clip — great for pulling quotes, music cues, or sound effects from video.
Original Format Preserved
The output file uses the same audio codec as the input. Cutting WAV stays WAV, MP3 stays MP3 — no re-encoding quality loss.
Private Processing
Your audio files are processed in an isolated environment and deleted automatically within one hour of conversion.
Compatibility
Supported Formats
All the formats you need, all in one place.
| Format | Description | Extension | Best Used For |
|---|---|---|---|
| MP3 | Cut MP3 files with minimal re-encoding | .mp3 |
Ringtones, music clips, podcast excerpts |
| WAV | Trim WAV files with lossless precision | .wav |
Studio samples, sound design clips |
| FLAC | Cut lossless FLAC without quality loss | .flac |
Archival audio segments, hi-res clips |
| AAC | Trim AAC/M4A audio files | .aac |
iTunes music excerpts, podcast clips |
| OGG | Cut OGG Vorbis audio segments | .ogg |
Game audio loops, web audio clips |
| M4A | Trim Apple M4A voice memos and music | .m4a |
iPhone recordings, iTunes clips |
| MP4 (AUDIO) | Extract specific audio segment from video | .mp4 |
Film dialogue clips, video quotes |
FAQ
Frequently Asked Questions
Use the format HH:MM:SS or simply seconds. For example, to start at 1 minute 30 seconds enter
1:30 or 90. Duration works the same way — enter 0:45 or 45 for a 45-second clip.
Minimal quality impact. For MP3 cutting, FFmpeg can use stream copy mode for near-lossless results. The cut point may shift slightly (by a few frames) to align to an MP3 frame boundary — this is imperceptible in practice.
Yes, as long as the file is under 500 MB. Long podcasts, audiobooks, and lecture recordings are all supported. Simply set the appropriate start time and duration for the segment you need.
Absolutely. For iPhone ringtones, cut your desired audio clip (max 30 seconds for a ringtone) and then convert the result to M4A using our M4A Converter. Rename the file to .m4r and add it to iTunes.
Set the start time to the point where real audio begins and leave the duration as the remaining length of the track. You can also use our Noise Remover for more advanced audio cleanup.
Yes — by default, the cutter outputs in the same format as the input file. If you need a different format, run the result through our Audio Converter.
Real-World Uses
Who Uses Audio Cutter?
From everyday users to professionals — see how people rely on this tool every day.
iPhone User
Create Custom Ringtones in 30 Seconds
Trim the perfect 30-second hook from any song, then convert to M4A (.m4r) for a fully custom iPhone ringtone with no apps required.
Podcaster
Extract Clean Interview Segments
Cut a specific answer or quote from a long recording to use as a standalone audio clip for social media or show notes.
DJ / Producer
Isolate Samples from Full-Length Tracks
Grab a specific drum break, melody riff, or sound effect from a long audio file and bring it into your DAW as a clean sample.
Educator
Clip Lecture Audio for Online Courses
Cut a full lecture recording into topic-based segments for a structured online course without re-recording anything.
Video Creator
Trim a Specific Scene's Audio
Extract audio from a video file and then cut to the exact scene dialogue or music cue needed for a separate edit.
Content Creator
Build Short Audio Previews and Teasers
Snip the most compelling 15–60 seconds from a podcast, song, or interview to share as an audio preview on social platforms.
Why TransmuteBox?
TransmuteBox vs. Alternatives
See how we compare to desktop software and other online converters.
| Feature |
Our Tool TransmuteBox |
Desktop DAW | Other Online |
|---|---|---|---|
| Frame-accurate cutting | |||
| Format preserved (no re-encode) | |||
| Supports all major formats | |||
| Video audio extraction | |||
| No software install | |||
| Mobile browser support | |||
| Free to use |
Under the Hood
Technical Specifications
Built on industry-standard open-source tools for maximum quality and reliability.
Limits & Restrictions
- Max file size: 500 MB
- Time precision: HH:MM:SS.mmm
- Output format matches input
FFmpeg
Stream Copy
MP3
WAV
FLAC
AAC
Trim
Conversion Engine
FFmpeg 6.x · stream copy mode for lossless cuts
Output Quality
No re-encoding for matching input/output formats; original quality preserved
Average Speed
Typical cut: 3–10 seconds regardless of source file length
Data Security
HTTPS transfer · isolated temp dir · auto-purged in 2 h
Precision
Millisecond accuracy
Re-encode
Only when format changes
Max File
500 MB
Auto-Delete
2 hours
Complete Guide
How to Cut Audio Files Precisely: A Practical Guide
Cutting audio files sounds simple, but the details matter. The difference between a clean cut and an artefact-riddled one often comes down to understanding how your audio cutter handles codec frames, re-encoding, and timing precision. This guide explains everything you need to know to get perfect results every time.
Stream Copy vs Re-Encoding: Why It Matters
Entering Precise Start Times
The time format for audio cutting is flexible. All of the following are valid inputs: 1:30 (1 minute 30 seconds), 90 (90 seconds), 01:30:00 (1 hour 30 minutes), 1:30.500 (1 minute 30.5 seconds). For ringtone creation, aim for a start time that catches the song at a musically strong moment — an intro riff, a chorus, or a recognisable hook — rather than the very beginning of the track.
Creating iPhone Ringtones with the Audio Cutter
iPhone ringtones must be 30 seconds or shorter. The workflow: (1) cut your desired clip with the Audio Cutter; (2) convert the result to M4A (AAC) using the M4A Converter; (3) download the M4A file and rename the extension to .m4r; (4) open iTunes or Music on a Mac, drag the .m4r file in, and sync your iPhone. The custom ringtone then appears in Settings → Sounds & Haptics → Ringtone.
Extracting Audio Clips from Video Files
Uploading a video file (MP4, MKV, MOV, AVI) allows you to extract a specific time range of audio. This is useful for pulling dialogue from a film scene, extracting a song from a music video, or grabbing a sound effect from a long video recording. The audio cutter decodes the audio stream, cuts the specified range, and returns it as an audio file — all in one step, saving the intermediate step of a full audio extraction followed by a separate cut.
Best Practices for Podcast Editing with the Audio Cutter
For podcast segment extraction, identify your in and out points by listening to the recording and noting timestamps. When cutting, add 0.5–1 second of buffer before and after the desired segment to avoid cutting into words at the edges. If you need to remove noise at the beginning or end of the clip, run the result through the Noise Remover after cutting. For final delivery, re-encode the cut segment to 128 kbps MP3 mono using the Audio Compressor.